this question has been posted several times in the past and i believe the results have been about equal, some unload and clean right away and some leave loaded.

i personally have a precussion stainless traditions deerhunter and only clean after i shoot. i will leave loaded all season with regular black power and patched roundball and the rest of the year if i don' t see any deer and put a cap on opening day of the following season ...never had a misfire.

i' ve been doing it like this for years and have not seen any corrosion or damage when inspecting the breech plug during cleaning ...hasn' t affected the accuracy of the rifle either.

i think it' s all in what you feel comfortable with.